Abstract

This document describes how the use of the Secure Real-time transport
protocol (SRTP) [RFC3711]. can be negotiated using the RTP/AVP (Audio
Video Profile) defined in [RFC3551]. Such a mechanism is used to
provide a means for encrypted media to be used in environments where
support for encryption is not known in advance, and not required.
The same mechanism is also applied to negotiation of the Extended RTP
Profile for Real-time Transport Control Protocol Based Feedback (RTP/
AVPF) [RFC4585].